| 摘要 |
According to a first aspect of the present invention, there is provided a self-regulating electrical heating cable comprising: a first power supply conductor extending along the length of the cable; a second power supply conductor extending along the length of the cable; a third power supply conductor extending along the length of the cable; the first and second power supply conductors being in electrical connection with each other via a first electrically conductive heating element body having a positive temperature coefficient of resistance, and the second and third power supply conductors being in electrical connection with each other via a second electrically conductive heating element body having a positive temperature coefficient of resistance, and wherein, in use, the first, second and third power supply conductors are not physically connected to one another. |
| 主权项 |
1. A self-regulating electrical heating cable comprising:
a first conductor extending along a length of the cable; a second conductor extending along the length of the cable; a third conductor extending along the length of the cable; the first conductor, the second conductor, and the third conductor extending alongside one another in a substantially planar arrangement, the second conductor being located between the first conductor and the third conductor; the first conductor and the second conductor being embedded in an electrically conductive heating element body having a positive temperature coefficient of resistance, the first conductor, the second conductor, and the third conductor being in electrical connection with each other, and physically separated from each other, via the electrically conductive heating element body; the second conductor being provided with a coating of electrically conductive material separating the second conductor from the heating element body, the coating of electrically conductive material having a higher electrical resistance than the electrical resistance of the electrically conductive heating element body, wherein the cable exhibits a first resistance between the first conductor and the third conductor, and a second resistance substantially equal to the first resistance between the second conductor and each of the first conductor and the third conductor; and wherein, at least in use, the first, second and third conductors are not physically connected to one another. |
